Thyra_DefaultDiagonalLinearOp_def.hpp

// @HEADER
// *****************************************************************************
//    Thyra: Interfaces and Support for Abstract Numerical Algorithms
//
// Copyright 2004 NTESS and the Thyra contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef THYRA_DIAGONAL_LINEAR_OP_DEF_HPP
#define THYRA_DIAGONAL_LINEAR_OP_DEF_HPP


#include "Thyra_DefaultDiagonalLinearOp_decl.hpp"
#include "Thyra_MultiVectorStdOps.hpp"
#include "Thyra_VectorStdOps.hpp"
#include "Thyra_VectorBase.hpp"
#include "Thyra_AssertOp.hpp"


namespace Thyra {


// Constructors/initializers/accessors


template<class Scalar>
DefaultDiagonalLinearOp<Scalar>::DefaultDiagonalLinearOp()
{}


template<class Scalar>
DefaultDiagonalLinearOp<Scalar>::DefaultDiagonalLinearOp(
  const RCP<const VectorSpaceBase<Scalar> > &space
  )
{
  initialize(space);
}


template<class Scalar>
DefaultDiagonalLinearOp<Scalar>::DefaultDiagonalLinearOp(
  const RCP<VectorBase<Scalar> > &diag
  )
{
  initialize(diag);
}


template<class Scalar>
DefaultDiagonalLinearOp<Scalar>::DefaultDiagonalLinearOp(
  const RCP<const VectorBase<Scalar> > &diag
  )
{
  initialize(diag);
}


template<class Scalar>
void DefaultDiagonalLinearOp<Scalar>::initialize(
  const RCP<const VectorSpaceBase<Scalar> > &space
  )
{
#ifdef TEUCHOS_DEBUG
  TEUCHOS_TEST_FOR_EXCEPT(space.get()==NULL);
#endif
  initialize(createMember(space)); // Note that the space is guaranteed to be remembered here!
}


template<class Scalar>
void DefaultDiagonalLinearOp<Scalar>::initialize(
  const RCP<VectorBase<Scalar> > &diag
  )
{
  diag_.initialize(diag);
}


template<class Scalar>
void DefaultDiagonalLinearOp<Scalar>::initialize(
  const RCP<const VectorBase<Scalar> > &diag
  )
{
  diag_.initialize(diag);
}


template<class Scalar>
void DefaultDiagonalLinearOp<Scalar>::uninitialize()
{
  diag_.uninitialize();
}


// Overridden from DiagonalLinearOpBase


template<class Scalar>
bool DefaultDiagonalLinearOp<Scalar>::isDiagConst() const
{
  return diag_.isConst();
}


template<class Scalar>
RCP<VectorBase<Scalar> > 
DefaultDiagonalLinearOp<Scalar>::getNonconstDiag()
{
  return diag_.getNonconstObj();
}


template<class Scalar>
RCP<const VectorBase<Scalar> > 
DefaultDiagonalLinearOp<Scalar>::getDiag() const
{
  return diag_.getConstObj();
}


// Overridden from LinearOpBase


template<class Scalar>
RCP< const VectorSpaceBase<Scalar> >
DefaultDiagonalLinearOp<Scalar>::range() const
{
  return diag_.getConstObj()->space();
}


template<class Scalar>
RCP< const VectorSpaceBase<Scalar> >
DefaultDiagonalLinearOp<Scalar>::domain() const
{
  return diag_.getConstObj()->space();
}


template<class Scalar>
RCP<const LinearOpBase<Scalar> >
DefaultDiagonalLinearOp<Scalar>::clone() const
{
  return Teuchos::rcp(new DefaultDiagonalLinearOp<Scalar>(diag_.getConstObj()->clone_v()));
}


// protected


// Protected functions overridden from LinearOpBase


template<class Scalar>
bool DefaultDiagonalLinearOp<Scalar>::opSupportedImpl(EOpTransp /* M_trans */) const
{
  return true;
}


template<class Scalar>
void DefaultDiagonalLinearOp<Scalar>::applyImpl(
  const EOpTransp M_trans,
  const MultiVectorBase<Scalar> &X,
  const Ptr<MultiVectorBase<Scalar> > &Y,
  const Scalar alpha,
  const Scalar beta
  ) const
{
  typedef Teuchos::ScalarTraits<Scalar> ST;

#ifdef TEUCHOS_DEBUG
  THYRA_ASSERT_LINEAR_OP_MULTIVEC_APPLY_SPACES(
    "DefaultDiagonalLinearOp<Scalar>::apply(...)",*this, M_trans, X, &*Y
    );
#endif // TEUCHOS_DEBUG

  // Y = beta * Y

  if( beta != ST::one() ) scale<Scalar>(beta, Y);

  // Y += alpha *op(M) * X

  const Ordinal m = X.domain()->dim();

  for (Ordinal col_j = 0; col_j < m; ++col_j) {
    const RCP<const VectorBase<Scalar> > x = X.col(col_j);
    const RCP<VectorBase<Scalar> > y = Y->col(col_j);
    if (ST::isComplex) {
      if ( M_trans==NOTRANS || M_trans==TRANS ) {
        ele_wise_prod( alpha, *diag_.getConstObj(), *x, y.ptr() );
      }
      else {
        ele_wise_conj_prod( alpha, *diag_.getConstObj(), *x, y.ptr() );
      }
    }
    else {
      ele_wise_prod( alpha, *diag_.getConstObj(), *x, y.ptr() );
    }
  }

}


} // end namespace Thyra


#endif  // THYRA_DIAGONAL_LINEAR_OP_DEF_HPP